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[src/trunk]: src/external/bsd/libc++/dist/libcxxrt/src Merge 47661d00cd4d6cd7...



details:   https://anonhg.NetBSD.org/src/rev/896400abc476
branches:  trunk
changeset: 1021404:896400abc476
user:      joerg <joerg%NetBSD.org@localhost>
date:      Sun May 30 00:12:31 2021 +0000

description:
Merge 47661d00cd4d6cd728ae31b0bb29a49a6c06272a

diffstat:

 external/bsd/libc++/dist/libcxxrt/src/exception.cc        |    54 +-
 external/bsd/libc++/dist/libcxxrt/src/libelftc_dem_gnu3.c |  1243 ++++++++----
 external/bsd/libc++/dist/libcxxrt/src/unwind-itanium.h    |     1 +
 3 files changed, 887 insertions(+), 411 deletions(-)

diffs (truncated from 3002 to 300 lines):

diff -r 7f5f40885aab -r 896400abc476 external/bsd/libc++/dist/libcxxrt/src/exception.cc
--- a/external/bsd/libc++/dist/libcxxrt/src/exception.cc        Sun May 30 00:08:19 2021 +0000
+++ b/external/bsd/libc++/dist/libcxxrt/src/exception.cc        Sun May 30 00:12:31 2021 +0000
@@ -304,13 +304,17 @@
 static void exception_cleanup(_Unwind_Reason_Code reason, 
                               struct _Unwind_Exception *ex)
 {
-       __cxa_free_exception(static_cast<void*>(ex));
+       // Exception layout:
+       // [__cxa_exception [_Unwind_Exception]] [exception object]
+       //
+       // __cxa_free_exception expects a pointer to the exception object
+       __cxa_free_exception(static_cast<void*>(ex + 1));
 }
 static void dependent_exception_cleanup(_Unwind_Reason_Code reason, 
                               struct _Unwind_Exception *ex)
 {
 
-       __cxa_free_dependent_exception(static_cast<void*>(ex));
+       __cxa_free_dependent_exception(static_cast<void*>(ex + 1));
 }
 
 /**
@@ -340,7 +344,8 @@
                if (info->foreign_exception_state != __cxa_thread_info::none)
                {
                        _Unwind_Exception *e = reinterpret_cast<_Unwind_Exception*>(info->globals.caughtExceptions);
-                       e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e);
+                       if (e->exception_cleanup)
+                               e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e);
                }
                else
                {
@@ -516,7 +521,7 @@
                        break;
                }
        }
-       assert(buffer > 0 &&
+       assert(buffer >= 0 &&
               "Trying to free something that is not an emergency buffer!");
        // emergency_malloc() is expected to return 0-initialized data.  We don't
        // zero the buffer when allocating it, because the static buffers will
@@ -556,7 +561,7 @@
 {
        // If this allocation is within the address range of the emergency buffer,
        // don't call free() because it was not allocated with malloc()
-       if ((e > emergency_buffer) &&
+       if ((e >= emergency_buffer) &&
            (e < (emergency_buffer + sizeof(emergency_buffer))))
        {
                emergency_malloc_free(e);
@@ -854,6 +859,13 @@
 
        assert(ex->handlerCount > 0 && "Rethrowing uncaught exception!");
 
+       // `globals->uncaughtExceptions` was decremented by `__cxa_begin_catch`.
+       // It's normally incremented by `throw_exception`, but this path invokes
+       // `_Unwind_Resume_or_Rethrow` directly to rethrow the exception.
+       // This path is only reachable if we're rethrowing a C++ exception -
+       // foreign exceptions don't adjust any of this state.
+       globals->uncaughtExceptions++;
+
        // ex->handlerCount will be decremented in __cxa_end_catch in enclosing
        // catch block
        
@@ -1199,11 +1211,13 @@
        // we see is a foreign exception then we won't have called it yet.
        __cxa_thread_info *ti = thread_info();
        __cxa_eh_globals *globals = &ti->globals;
-       globals->uncaughtExceptions--;
        _Unwind_Exception *exceptionObject = static_cast<_Unwind_Exception*>(e);
 
        if (isCXXException(exceptionObject->exception_class))
        {
+               // Only exceptions thrown with a C++ exception throwing function will
+               // increment this, so don't decrement it here.
+               globals->uncaughtExceptions--;
                __cxa_exception *ex =  exceptionFromPointer(exceptionObject);
 
                if (ex->handlerCount == 0)
@@ -1280,12 +1294,13 @@
        
        if (ti->foreign_exception_state != __cxa_thread_info::none)
        {
-               globals->caughtExceptions = 0;
                if (ti->foreign_exception_state != __cxa_thread_info::rethrown)
                {
                        _Unwind_Exception *e = reinterpret_cast<_Unwind_Exception*>(ti->globals.caughtExceptions);
-                       e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e);
+                       if (e->exception_cleanup)
+                               e->exception_cleanup(_URC_FOREIGN_EXCEPTION_CAUGHT, e);
                }
+               globals->caughtExceptions = 0;
                ti->foreign_exception_state = __cxa_thread_info::none;
                return;
        }
@@ -1339,6 +1354,14 @@
 }
 
 /**
+ * Cleanup, ensures that `__cxa_end_catch` is called to balance an explicit
+ * `__cxa_begin_catch` call.
+ */
+static void end_catch(char *)
+{
+       __cxa_end_catch();
+}
+/**
  * ABI function, called when an exception specification is violated.
  *
  * This function does not return.
@@ -1346,6 +1369,12 @@
 extern "C" void __cxa_call_unexpected(void*exception) 
 {
        _Unwind_Exception *exceptionObject = static_cast<_Unwind_Exception*>(exception);
+       // Wrap the call to the unexpected handler in calls to `__cxa_begin_catch`
+       // and `__cxa_end_catch` so that we correctly update exception counts if
+       // the unexpected handler throws an exception.
+       __cxa_begin_catch(exceptionObject);
+       __attribute__((cleanup(end_catch)))
+       char unused;
        if (exceptionObject->exception_class == exception_class)
        {
                __cxa_exception *ex =  exceptionFromPointer(exceptionObject);
@@ -1472,6 +1501,15 @@
                return info->globals.uncaughtExceptions != 0;
        }
        /**
+        * Returns the number of exceptions currently being thrown that have not
+        * been caught.  This can occur inside a nested catch statement.
+        */
+       int uncaught_exceptions() throw()
+       {
+               __cxa_thread_info *info = thread_info();
+               return info->globals.uncaughtExceptions;
+       }
+       /**
         * Returns the current unexpected handler.
         */
        unexpected_handler get_unexpected() throw()
diff -r 7f5f40885aab -r 896400abc476 external/bsd/libc++/dist/libcxxrt/src/libelftc_dem_gnu3.c
--- a/external/bsd/libc++/dist/libcxxrt/src/libelftc_dem_gnu3.c Sun May 30 00:08:19 2021 +0000
+++ b/external/bsd/libc++/dist/libcxxrt/src/libelftc_dem_gnu3.c Sun May 30 00:12:31 2021 +0000
@@ -1,5 +1,6 @@
 /*-
- * Copyright (c) 2007, 2008 Hyogeol Lee <hyogeollee%gmail.com@localhost>
+ * Copyright (c) 2007 Hyogeol Lee <hyogeollee%gmail.com@localhost>
+ * Copyright (c) 2015-2017 Kai Wang <kaiwang27%gmail.com@localhost>
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -54,12 +55,17 @@
 };
 
 #define BUFFER_GROWFACTOR      1.618
+#define BUFFER_GROW(x)         (((x)+0.5)*BUFFER_GROWFACTOR)
+
+#define        ELFTC_FAILURE           0
+#define        ELFTC_ISDIGIT(C)        (isdigit((C) & 0xFF))
+#define        ELFTC_SUCCESS           1
+
 #define VECTOR_DEF_CAPACITY    8
-#define        ELFTC_ISDIGIT(C)        (isdigit((C) & 0xFF))
 
 enum type_qualifier {
        TYPE_PTR, TYPE_REF, TYPE_CMX, TYPE_IMG, TYPE_EXT, TYPE_RST, TYPE_VAT,
-       TYPE_CST, TYPE_VEC
+       TYPE_CST, TYPE_VEC, TYPE_RREF
 };
 
 struct vector_type_qualifier {
@@ -73,27 +79,47 @@
        READ_TYPE, READ_FUNC, READ_PTRMEM
 };
 
+struct read_cmd_item {
+       enum read_cmd cmd;
+       void *data;
+};
+
 struct vector_read_cmd {
        size_t size, capacity;
-       enum read_cmd *r_container;
+       struct read_cmd_item *r_container;
+};
+
+enum push_qualifier {
+       PUSH_ALL_QUALIFIER,
+       PUSH_CV_QUALIFIER,
+       PUSH_NON_CV_QUALIFIER,
 };
 
 struct cpp_demangle_data {
        struct vector_str        output;        /* output string vector */
-       struct vector_str        output_tmp;
        struct vector_str        subst;         /* substitution string vector */
        struct vector_str        tmpl;
        struct vector_str        class_type;
+       struct vector_str       *cur_output;    /* ptr to current output vec */
        struct vector_read_cmd   cmd;
-       bool                     paren;         /* parenthesis opened */
-       bool                     pfirst;        /* first element of parameter */
        bool                     mem_rst;       /* restrict member function */
        bool                     mem_vat;       /* volatile member function */
        bool                     mem_cst;       /* const member function */
+       bool                     mem_ref;       /* lvalue-ref member func */
+       bool                     mem_rref;      /* rvalue-ref member func */
+       bool                     is_tmpl;       /* template args */
+       bool                     is_functype;   /* function type */
+       bool                     ref_qualifier; /* ref qualifier */
+       enum type_qualifier      ref_qualifier_type; /* ref qualifier type */
+       enum push_qualifier      push_qualifier; /* which qualifiers to push */
        int                      func_type;
        const char              *cur;           /* current mangled name ptr */
        const char              *last_sname;    /* last source name */
-       int                      push_head;
+};
+
+struct type_delimit {
+       bool paren;
+       bool firstp;
 };
 
 #define        CPP_DEMANGLE_TRY_LIMIT  128
@@ -102,6 +128,8 @@
 #define        FLOAT_EXTENED_BYTES     10
 
 #define SIMPLE_HASH(x,y)       (64 * x + y)
+#define DEM_PUSH_STR(d,s)      cpp_demangle_push_str((d), (s), strlen((s)))
+#define VEC_PUSH_STR(d,s)      vector_str_push((d), (s), strlen((s)))
 
 static size_t  get_strlen_sum(const struct vector_str *v);
 static bool    vector_str_grow(struct vector_str *v);
@@ -213,7 +241,7 @@
 
        assert(v->capacity > 0);
 
-       tmp_cap = v->capacity * BUFFER_GROWFACTOR;
+       tmp_cap = BUFFER_GROW(v->capacity);
 
        assert(tmp_cap > v->capacity);
 
@@ -314,7 +342,7 @@
        if (dst == NULL || org == NULL)
                return (false);
 
-       tmp_cap = (dst->size + org->size) * BUFFER_GROWFACTOR;
+       tmp_cap = BUFFER_GROW(dst->size + org->size);
 
        if ((tmp_ctn = malloc(sizeof(char *) * tmp_cap)) == NULL)
                return (false);
@@ -342,6 +370,47 @@
 }
 
 /**
+ * @brief Push org vector to the tail of det vector.
+ * @return false at failed, true at success.
+ */
+static bool
+vector_str_push_vector(struct vector_str *dst, struct vector_str *org)
+{
+       size_t i, j, tmp_cap;
+       char **tmp_ctn;
+
+       if (dst == NULL || org == NULL)
+               return (false);
+
+       tmp_cap = BUFFER_GROW(dst->size + org->size);
+
+       if ((tmp_ctn = malloc(sizeof(char *) * tmp_cap)) == NULL)
+               return (false);
+
+       for (i = 0; i < dst->size; ++i)
+               tmp_ctn[i] = dst->container[i];
+
+       for (i = 0; i < org->size; ++i)
+               if ((tmp_ctn[i + dst->size] = strdup(org->container[i])) ==
+                   NULL) {
+                       for (j = 0; j < i + dst->size; ++j)
+                               free(tmp_ctn[j]);
+
+                       free(tmp_ctn);
+
+                       return (false);
+               }
+
+       free(dst->container);
+
+       dst->container = tmp_ctn;
+       dst->capacity = tmp_cap;
+       dst->size += org->size;
+
+       return (true);
+}
+
+/**
  * @brief Get new allocated flat string from vector between begin and end.
  *
  * If r_len is not NULL, string length will be returned.
@@ -387,6 +456,7 @@



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